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nope aslong as the filter is still there it will be fine . it wil sound better if thats what your after but you will get heat soak and slow you down a bit .
Basically I took it off where it attaches to the engine, which made it loader, but slower. Since I put it back on though, the kick at 5k seems less than normal. Also the acoustic valve (at least i think thats where the noise is coming from) is making mile more noise than before.
Will it eventually clear itself out? I didnt drive with it off, but the engine was on when I took it off. Also, why would this effect the acoustic valve sound?